Anchor-box for joists.



, PATE'NTBD' APR. 14, 1903. R; W. WHITEHUR ST. ANCHOR BOX-FOR JO'ISTS.

APPLICATION FILED JAN. 3, 1903.

F0 MODEL.

I I I .[nve nCTar tflttorngys UNITED STATES PATENT OFFICE.

ROBERT'WJ WIIITEHURST, OF NORFOLK, VIRGINIA.

NoHoR-Box FORJOlSTS.

SIECIFIGATION formingpartof Letters Patent No. 725,526, dated April 14,1903. Application filed January 3, 1903- Serial No. 137,648. (No model.)

- T all whom it may concern;-

Be it known that I, ROBERT W.'WH1TE- HURST, a citizen of the UnitedState's,'residing at Norfolk, in the county of'Norfolk and State ofVirginia, have invented certain new and useful Improvements inAnchor-Boxes for Joists and Girders, of which the following is aspecification.

This invention relates to improvements in anchor boxes which areembedded in the. brick or stone walls of buildings for the support ofthe girders and joists and for the protection of the ends of the samefrom dampness and the ignition that otherwise might result from theproximity of a heating-flue in the wall.

The invention consists of certain constructions, arrangements, andcombination of parts hereinafter fully described and claimed, referencebeing had to the accompanying drawings, in which Figure 1 is a side viewof. my improved an-' chor-box in a brick wall and supporting'one' end ofa girder or joist. Fig. 2 is a rear perspective view of the anchor-boxwith the parts separated from each other and in juxtaposi tion. Fig. 3is a front perspective View of the box with the parts assembled.

My improved anchor-box comprises two separable parts or sectionsnamely,a support A for the girder or joist and a protect ing-cover B. Thesupport A consists of-a horizontal base-plate a, provided atitsrear withan upwardlycxtending flange b and also provided with two transversebarsiofi connecting at their rear with said flange and at the rearforming shoulders o, and said bars having their upper edges inclineddownward from said high shoulders to their front ends. The locationofsaid cross-bars o is such as to leave a ledg'e'd at each endof theplate a on the outside of each bar.- Astud e is located between the twocross-bars and pro'-- jects from the upper surface of-thebaseplate, asillustrated in the drawings.

The cover B, be fore mentioned, consists of a box-like structure havingatop f, a rear wall g, and two vertical side walls h, whose lower edgesh are inclined complementary to the inclined edges of the cross-bars-c,and

the cover is also provided with shoulders 71, which project downward andengage the shoulders c on the cross-bars. The front and bottom ofsaidcover are open.

In the assembled condition of the anchorbox the cover B rests upon thesupport A, with the inclined edges h of the cover resting upon theinclined edges c of the crossbars 0, the lower edge g or the rear wallabutting upon the rear flange b, and the downshoulders h abuttingagainst the up-shoulders c. A sidewise movement of the cover B withrespect to the support A is prevented by means of a V-shaped tonguel onthe rear of one part fitting into a corresponding recess Z on the otherpart.

In practical use the support A of my improved anchor-box is embedded ina wall, withthe brickwork or stonework built about it and on the twoledges d and about the rear 'flangeb, so that it is firmly anchored inplace, and thenthe end of the joist or girderm is ins'erted between thetwo cross-bars c and rests on thebase-plate a, and said joist or girderis provided with a socket m, which receives the'stud e, soas to securethe joist or girder in place and prevent anylongitudinal movement of-the latter with respect to its support. Thecover B' is then appliedover the end of the joistor-girder and on the support, so that the partsofthe box are assembled as before described, andthe brickwork orstonework of the building-wall is then continued, so as to inclose thetop, rear, and two sides of said cover and hold it firmly in place onthe support A.

Itis to be especially observed that I have providedatwo-part orsectional anchor-box,

of which'one part is supported on the other in such a manner -that is,by the inclined edges h and c that a forward movement of the is upon thecover B, because any forward movement of the support A or rearwardmovement of the cover 13 must eifect a raising of said cover, as beforeexplained, and such movement is resisted by the Weight of the upper partof the wall. It is evident that any movement of the support A and cover13 with respect to each other in a direction opposite to that justdescribed is prevented by the abutting shoulders c and 7t. It is also tobe observed that the end m of the girder or joist is beveled on top, asindicated in dotted lines, Fig. 1, so that in the event of fire and theburning of said girder or joist the said end may clear the top of thecover B and tilt out when the girder or joist sags or breaks down,thereby preventing the building-wall from being pulled down with it.

It is obvious that the upwardly-extending flange I) need not extendoutwardly beyond the transverse bars 0', and it is to be understood thatthe ledges cl may be dispensed with, if desired.

I-Iaviug thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. An anchor-box for the support of the end of a joist or girder,comprising a basesupport provided with means for engagement with the endof a girder or the like; and a cover resting on said support, abut-tingedges of the support and cover being correspondingly inclined, whereby arelative forwardand-backward movement between the support and cover willraise the latter.

2. An anchor-box, comprising a base-support provided with cross-barswhose upper edges are inclined; and a cover adapted to rest on saidcross-bars, whereby a relative f0rward-and-backward movement between thesupport and cover will raise the latter.

3. An anchor-box for the purpose described, comprising a supportprovided with means for engagement with the end of a girder or the likeand also provided with two crossbars whose upper edges are inclined; andan open front cover adapted to rest on said cross-bars, the lowersideedges of said cover being inclined correspondingly to said crossbars.

4. Au anchor-box for the purpose described, comprising a base supportprovided with means for engagement with the end of agirder or the likeand also provided with a rear upwardly-extending flange and twocross-bars which project at the rear above said flange whereby to formshoulders, and whose upper edges incline downwardly from the rear to thefront; and an open-front cover adapted to rest on said cross-bars, thelower side edges of said cover being inclined correspondingly to saidbars, and said cover being provided with shoulders adapted to engage theshoulders of said bars whereby to prevent a forward movement of thecover on the bars.

5. An anchor-box comprising a support provided with means for engagementwith the end-of a girder or the like, a rear upwardly-extending flangehaving a recess, and two cross-bars whose upper edges are inclined andwhich project at the rear above said flange whereby to form shoulders;and an open-front cover adapted to rest on said crossbars, the lowersideedges of said cover being inclined correspondingly to said cross-bars,and said cover being provided with shoulders adapted to engage theshoulders of said .bars and also provided with a tongue adapted to enterthe recess of said flange whereby to prevent the sidewise movement ofthe cover on the support.

In testimony whereof I affix my signature in the presence of twowitnesses.

ROBERT W. WIIITEHURST.

Witnesses:

J. Rov COLLINS, J. STANLEY TRICE.

